Dental attachment



H. E. S. CHAYES.

DENTAL ATTACHMENT.

APPLICATION FILED OCT-14,19.

Patented May 31. 1921.

1 I ED a A -j' H YE 'bENEW O K; i i-Y.-

. DENTALZATTAGHMENT. l

roazzwhm ma; aha-a broken plan view of the end view of the reamer.

Be .it known that I, .HERMAN E. S.

CHAYES, a citizen of the United States, re

siding at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Dental Attachments, of which the following is a specification.

This invention has reference particularly to the construction of bridgework and lts object primarily is to'insure absolute parallelism at the abutments.

Accordingly, the invention may be sa1d to reside in the provision of means for guiding the drill or cutting tool so as to produce a bore at one abutment 1n parallelism with the bore previously formed in the other abutment.

In the drawing I have illustrated the mvention embodied in one practical form, but it will be apparent from what follows that certain changes and modifications maybe made without departing from the true spirit and scope of the invention. 7

In this drawing, Figure 1 is a front v ew illustrating the use of the invention In drilling a bore for the pin of the second abutment, using the bore of the first abutment as a guide for insuring parallellsm; Flg. 2 is a similar view showing the use of the second bore as a guide for the reamlng out and truing up of the first bore; Figs. 3 and 4 are broken detail views of a drill and a reamer as held in the guide; Flg. 5 1s a guide; Fig. 6 is an In the practical use of the invention, a bore 7 for the first bridge pm is first drilled in one of the bridge abutments 8, 9, and then this bore is used as a guide for drilling the bore for the second bridge pm by inserting a guide pin 10 in this first bore which supports a guide 11 for the tool which cuts the second bore.

In the illustration. this guide is in the form of a block having a guide passage 12 therethrough rotatably receiving the shank of the drill or cutting tool 13, and this block Specifieation of Letters fatent.

I Patented May31',1921. Application filed 0ct'obe1f 1 ,1 9!.15 i? l'N-Y 0,6

of j aws'. 117 embracing the edge portions :of

the bar to confine the block thereto; A clamp screw 18 seated in the block and hearing agalnst the bar at its inner end serves to secure the block in the position to which 7 it is adjusted. In a similar way the spacer bar is adjustably secured on the shank of the guide pin by a clamp screw 19, seated in the end portion of the barand hearing at its inner end on the guide pin 10.

By these means the spacer bar may be set at any point longitudinally on the guide pm and the cutting tool guide may be set at any required distance from the guide pin to suit the distance between the bridge abutments. Once properly set, the device provides a guide which insures the drilling of the secondbore in absolute the first bore.

After drillingthe second bore,-the first parallelism with bore may be smoothed and cleaned out as by means of a reamer 20, illustrated in Figs. 2, 4 and 6, held in the passage in the guide block, reversing the device in this instance and using the second bore as a guide by engaging the guide pin in that passage, as

bores in dental bridgework, a guide pin for engagement in a bore in one of the bridge abutments, a spacer bar slidably adjustable longitudinally on said guide pin, and a cutting tool guide slidably adjustable longitudinally on the spacer bar to the plane of the second bridge abutment and provided with a guide passage disposed parallel to the guide pin for the reception of a cutting tool.

2. In a device for producing parallel bores in dental bridgework, a spacer bar having apassage through one end thereof,

a guide pin slidably engaged'in said passage, means for securing the guide pin in adjusted position in said passage, a tool guide horizontally slidably engaged on the spacer bar and provided with a tool guid- 111g passage therethrough parallel to, the guide pin passage and Ineans for securing said tool guide in horizontally adjusted position on the spacer bar.

3. In a device for producing parallel bores in dental hridgework, a spacer bar having a passage through one end portion thereof, a gulde pin slidably engaged in said passage, a clamp screw securing said guide pinv in adjusted positionin the passage, a channeled tool guide slidably engaged on the pln passage and a clamp screw securing the 001 guidein adjusted position on the spacer an a In testimony whereof I affiX my signature. 2

vHERMAN E. S. GHAYES. 

